[GHC] #10190: Add a Monad instance for ((,) w)

[GHC]

#10190: Add a Monad instance for ((,) w)
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        Reporter:  fumieval          |                   Owner:  fumieval
            Type:  feature request   |                  Status:  patch
        Priority:  normal            |               Milestone:  7.12.1
       Component:  libraries/base    |                 Version:
      Resolution:                    |                Keywords:
Operating System:  Unknown/Multiple  |            Architecture:
 Type of failure:  None/Unknown      |  Unknown/Multiple
      Blocked By:                    |               Test Case:
 Related Tickets:                    |                Blocking:
                                     |  Differential Revisions:
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Comment (by fumieval):

 Sorry, I couldn't find the thread which proposed this instance.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10190#comment:6>
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